The hotel shapes and colored areas you saw in the last exercise are the last type of geometry we'll get to know today: polygons. Polygons are used for bigger objects whose shape matters more to us than anything else, such as parks, lakes, districts etc. Technically speaking, polygons are defined using closed linestrings. What differentiates them from closed linestrings is that polygons have an area greater than 0. Below, we present an example polygon.
Polygons can be made up of single or multiple linestrings, but the latter case will be discussed in another part of the course.